eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=CELEX:32004L0038:en:NOT
This is a link to directive 64/221 which was repealed and replaced by Directive 2004/38/EC. All cases on the limitation of the freedom of movement were decided relying on the former Directive (64/221) prior to the enactment of the new Directive.

eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=CELEX:61974J0041:EN:HTML
This is a transcript of the leading case of Van Duyn (case 41/74), which limited the free movement of persons on grounds of public policy.

ec.europa.eu/justice_home/fsj/citizenship/wai/fsj_citizenship_intro_en.htm
This is a section of the Europa website about citizenship in the EU. It also explains rights and obligations resulting from citizenship and recent developments in the area.

ec.europa.eu/justice_home/fsj/citizenship/movement/fsj_citizenship_movement_en.htm
This is a section of the Europa website concerning the right to reside in the EU. It also deals with family rights and provides a study on the development of community law in this area.